MapPath的反函数(Reversing MapPath)
首先需要说明的一点是,目前Google到的结果,前几个解决方案是错的,因为它没有考虑到应用的虚拟根目录不是/的情况.
比如,如果应用的物理根目录是c:\website\piic\en,应用的虚拟路径为/en/,文件的路径为c:\websites\piic\en\images\aaa.jpg的话,按那几个解决方案,得到的结果将会是/images/aaa.jpg,而实际上应该是/en/images/aaa.jpg.
并且,MapPath是可以这么用的: MapPath("~/aaa.jpg"), 上述解决方案也没有处理这个特殊的目录(~).
下面附上我的解决方案:
Code
/// <summary>
/// Reverse of MapPath
/// </summary>
/// <param name="path">File path in the disk</param>
/// <returns>virtual path in current web application</returns>
public static string PathMap(string path)
{
// example 1:
// path: c:\websites\piic\en\images\aaa.jpg
// application root: c:\website\piic\en
// virtual root: /
// result: /en/images/aaa.jpg
// example 2:
// path: c:\websites\piic\en\images\aaa.jpg
// application root: c:\website\piic\en
// virtual root: /en/
// result: /en/images/aaa.jpg
if (path.StartsWith("~/"))
{
var virtualRoot = HostingEnvironment.ApplicationVirtualPath;
path = virtualRoot + path.Substring(2);
}
var approot = HostingEnvironment.ApplicationPhysicalPath;
return path.Replace(approot, string.Empty).Replace('\\', '/');
}
/// <summary>
/// Reverse of MapPath
/// </summary>
/// <param name="path">File path in the disk</param>
/// <returns>virtual path in current web application</returns>
public static string PathMap(string path)
{
// example 1:
// path: c:\websites\piic\en\images\aaa.jpg
// application root: c:\website\piic\en
// virtual root: /
// result: /en/images/aaa.jpg
// example 2:
// path: c:\websites\piic\en\images\aaa.jpg
// application root: c:\website\piic\en
// virtual root: /en/
// result: /en/images/aaa.jpg
if (path.StartsWith("~/"))
{
var virtualRoot = HostingEnvironment.ApplicationVirtualPath;
path = virtualRoot + path.Substring(2);
}
var approot = HostingEnvironment.ApplicationPhysicalPath;
return path.Replace(approot, string.Empty).Replace('\\', '/');
}